"native" transparency hotfix

• fixed a spelling error in utils/premutliply.frag that broke native transparency in most modules

Premultiply hotfix and stdin hotfix for vec4 datatypes

disclaimer: this release breaks "native" transparency, use 1.6.3 instead if you require it.

• Fixed a critical issue with --stdin that caused the alpha channel to be garbage data
• Added a premultiply step to bars to allow for proper handling of the alpha channel on "native" transparency. This is disabled by default, assign USE_ALPHA to 1 in bars.glsl to enable.

'circle' hotfix, stdin binding support

disclaimer: this release invokes undefined behavior due to a bug (fixed in later versions)

• A problem with artifacting in circle has been fixed, see #107
• --stdin has been added, which binds simple GLSL datatypes to STDIN in shaders. This evaluates to a uniform, and thus can be used to stream some data at runtime to GLava. This feature may be expanded on later (with backwards-compatible support for the current format/arguments)

FIFO support, new GLSL options, and many fixes.

• FIFO support has been added. See README.md for details, also see #78
• Added sampling modes for the GLSL smoothing pass to allow for more accurate output
• Added support for disabling shader passes through GLSL, see #97
• Enhanced rendering and options for graph, courtesy of @arch1t3cht30, see #97
• Fixed clickthrough on Openbox (and potentially other window managers), see #80
• Fixed the two lowest-frequency bars having the same value while running the bars module
• Fixed some build issues on Ubuntu, musl, see #94, #91
• Fixed a bug with circle that only manifested on some integrated graphics chips, see #70

Request option & other fixes

• Added a --request option to allow users to supply requests that would normally go in rc.glsl through the command line.
• Fixed a memory leak that occurred when the GLava window was repositioned (or the root pixmap updated) while "xroot" was selected.
• Fixed a bug where preprocessor directives would not work at the end of the file, due to not having a trailing line break.
• Most compilation output has been now limited to the --verbose option.

System include prefix & 'graph' module fixes

• Added a @ include prefix that reads from the system (installation) configuration path, rather than the active path (usually @ -> /etc/xdg/glava, : -> ~/.config/glava).
• Added some new functionality to the GLSL preprocessor that allows re-occurring defines to override the previous value instead of failing with an error
  • These two changes allow for including both the system and user module configurations into fragment shaders, which helps prevent breaking changes (see this reply in #73).
• The radial module now has configurable offsets, see #69
• The graph module has been optimized, has new defaults for the COLOR macro, and has new options to disable/enable the outline and highlight, see #76

Thanks to @Patiga, who exclusively reported the mentioned issues.

Static memory leak hotfix

• Fixed some minor leaks introduced through shader instantiation (non-growing).
• Fixed a bug where munmap was called on a buffer allocated through malloc. This didn't cause any issues on most systems, due to the underlying malloc implementation.

Window obstruction hotfix

• Fixed a critical issue that caused GLava to stop rendering if it was previously obstructed.

Makefile changes & desktop defaults

• i3, i3-gaps, and AwesomeWM now all have suitable defaults in their respective env_*.glsl files.
• The dependency on the glad submodule is no longer needed, but is optional. Pre-generated headers and bindings are provided in glad.c and glad.h, however users are free to generate their own by cloning into the submodule and running make glad in GLava build directory.
• make uninstall now properly respects DESTDIR
• SHADERDIR has been added as an option to the Makefile to customize where shaders are installed and used from (use with make and make install), by default it is /etc/xdg/glava.
• EXECDIR has also been added as a Makefile option to configure where the glava executable is installed to, by default it is /usr/bin/.

This update may have some breaking changes for package maintainers, my goal was to avoid glad causing problems with unreproducible builds.

Window visibility & makefile changes

• -march=native is no longer default in the Makefile. Sorry @coderobe!
• XROOTPMAP_ID is now monitored to handle changes to the root window background with `"xroot" transparency
• GLava now automatically suspends rendering when it is minimized (parent unmapped) or completely obscured, see #68. As a result #request setfullscreencheck has defaulted to false since the built-in behavior achieves the same effect in most circumstances.