Docs folder cleanup (#2366)

* delete accelerator.keys.txt

content is at https://github.com/kvirc/KVIrc/wiki/Keyboard-shortcuts

* delete INSTALL and doc/INSTALL.txt

content is at https://github.com/kvirc/KVIrc/wiki/installation

* delete doc/firefox.hack.txt

should no longer be needed

* delete doc/themes.howto.txt

content is at https://github.com/kvirc/KVIrc/wiki/tutorials

* delete doc/INSTALL-MacOS.txt

content is at https://github.com/kvirc/KVIrc/wiki/Compiling-KVIrc-from-git-on-macOS-Sierra

* add another VS file to .gitignore

* delete doc/FAQ

content is at https://github.com/kvirc/KVIrc/wiki/FAQ

* delete old TODOs

content should be, if relevant, in issues

* delete doc/addon.howto.txt

content is at https://github.com/kvirc/KVIrc/wiki/Addons

* delete doc/scripting.faq.txt

content is at https://github.com/kvirc/KVIrc/wiki/tutorials

* delete translations.howto.txt and translations.spanish.notes.txt

content should be at https://github.com/kvirc/KVIrc/wiki/Updating-KVIrc's-translations

* delete win32_run_cmake.bat

outdated?

* adjust CMakeLists.txt for removed files

* delete Windows compilation instructions

content is at https://github.com/kvirc/KVIrc/wiki/Compiling-KVIrc-on-Windows

* delete doc/hackers.guide.txt

content is at https://github.com/kvirc/KVIrc/wiki/The-Source-Tree

* delete doc/ui-style-tips.txt

content is at https://github.com/kvirc/KVIrc/wiki/Contributing-code-to-KVIrc's-repositories

* adjust README to doc changes

* move main license file to root

* adjust mentions of copyright files

* revert status badges back from shields.io

shields.io is overloaded all the time so the badges never display

* change cmake syntax

* restore the about license text to its original glory and install the amip license only on windows

* update GPL2 from the GNU website

* change the installer to show ABOUT-LICENSE as well

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