Update gitignore

Not only pro files but also qmlproject
Not only build/ also buildArm etc.
Update Cmake

cmake_minimum_required and In-tree build error
QmlCalc test extra info properties
TilEm backend cleanup and some bugfixing

Some pointers not always initiated and fixed segfaults
Do qmlplugindump after build
Add make rule for copying build files to the src dir
Cleanup
Add qmlproject
Add KeyBindings (not yet used)
Add prebuild AMD64 module for convenience