added: New API endpoint _cache_control. Solves #203

[starrify]

Fixes #203

[codecov-io]

Current coverage is 85.45%

Merging #339 into master will decrease coverage by -0.02% as of 9c34085

@@            master    #339   diff @@
======================================
  Files           40      40       
  Stmts         4655    4675    +20
  Branches       631     638     +7
  Methods          0       0       
======================================
+ Hit           3979    3995    +16
+ Partial        151     150     -1
- Missed         525     530     +5

Review entire Coverage Diff as of 9c34085

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[kmike]

Hey @starrify,

The feature makes sense, but I think it is not good to allow to set these options via HTTP API: they should be set at startup like other global Splash options.

[nramirezuy]

hey @starrify, was this working properly before? Because right now it seems to be ignoring QSettings.