* Adds a new Hotkeys tab in the Controls group.
* Double-click a Hotkey to rebind it.

Using the QtProfileSelectorDialog, this implementation is trivial. This mimics the real switch behavior of asking which user on every game boot, but it is default disabled as that might get inconvenient.

Allows capturing screenshot at the current internal resolution (native for software renderer), but a setting is available to capture it in other resolutions. The screenshot is saved to a single PNG in the current layout.

Greatly simplifies the current input UI, while still allowing power users to tweak advanced settings. Adds 'input profiles', which are easy autoconfigurations to make getting started easy and fast. Also has a custom option which brings up the current, full UI.

Prevents unnecessary reloads on every configuration operation.

As the add-ons column takes the most processing time out of any (as it needs to search registration for updates/dlc, patch control NCAs, search for mods, etc.), an option was added to disable it. This does not affect the application of add-ons. In large game collections, this decreases game list refresh time by as much as 70%.

Placing the array wholesale into the header places a copy of the whole
array into every translation unit that uses the data, which is wasteful.
Particularly given that this array is referenced from three different
translation units.

This also changes the array to contain pairs of const char*, rather than
QString instances. This way, the string data is able to be fixed into
the read-only segment of the program, as well as eliminate static
constructors/heap allocation immediately on program start.

configure_general.ui: Add UI Option for Themes

config.cpp: Save Theme Settings

* citra-qt: game list search function

* Empty search field during game list refresh

* Code improvements

* Code formatting

* Autofocus search field

* JayFoxRox's recommendations

* lioncash's review

This makes clang-format useful on those.

Also add a bunch of forgotten transitive includes, which otherwise
prevented compilation.

This also means : we have only one config file, now