Remove official support for QMake (#3839)

* delet chatterino.pro

* Update documentation

* Update Github Actions config

* Update Cirrus CI config

* Attempt to fix Cirrus CI

* Add changelog entry

* Delete tools/update_filelist.py

It was a QMake-only script? Maybe will need revert + change to CMake or something?

* fix?

* Fuck this linter

* Attempt to clean up build.yml a little

* Add cmaake to install list, remove step for qmake PATH

* Change list entries to always use 1.

Sneaky unrelated change

* These are no longer tests!

* FUCK YOU PRETTIER

* Make BUILDING_ON_LINUX.md simpler

* Get rid of Jenkins

* Get rid of travis

* Remove dupes

* Remove appveyor

* Remove qmake from conanfile

* Try removing explicit qmake path

* Nothing uses the qt style plugins installer anymore

* Update manual linux building instructions

* Update freebsd compilation instructions with a copy paste from the linux instructions

* Remove unused docker files

* Remove linux breakpad build script as it's unused

* Update changelog entry phrasing

* Lint build markdown files

* Change top changelog entry to not be confused as a link

* Skip QtCreator conan setup if conan is disabled

This reduces the amount of warnings & errors Windows users get with
QtCreator

* lint building on linux file

Co-authored-by: Rasmus Karlsson <rasmus.karlsson@pajlada.com>

.CI/CreateAppImage.sh

@@ -14,7 +14,6 @@ script_path=$(readlink -f "$0")
 script_dir=$(dirname "$script_path")
 chatterino_dir=$(dirname "$script_dir")
 
-qmake_path=$(command -v qmake)
 
 echo "Running LDD on chatterino binary:"
 ldd ./bin/chatterino
@@ -42,8 +41,7 @@ echo "Run LinuxDeployQT"
     appdir/usr/share/applications/*.desktop \
     -no-translations \
     -bundle-non-qt-libs \
-    -unsupported-allow-new-glibc \
-    -qmake="$qmake_path"
+    -unsupported-allow-new-glibc
 
 rm -rf appdir/home
 rm -f appdir/AppRun

.CI/InstallQTStylePlugins.sh

@@ -1,6 +0,0 @@
-git clone http://code.qt.io/qt/qtstyleplugins.git
-cd qtstyleplugins
-/opt/qt512/bin/qmake CONFIG+=release
-make -j$(nproc)
-sudo make install
-cd -