UI on all platforms(including NewUI!): Add options to change FramebufferCPUConvert without manual editing of INI file.
Fix typos.
Capitalise all phrases in the key; I forgot it's a key value, eheh.
Default FramebuffersCPUConvert to be true, remove option to enable/disable it on mobile/GLES2 platforms.
Merge pull request #2851 from thedax/framebufferConvertUIOption

UI on all platforms(including NewUI!): Add options to change FramebufferCPUConvert