Added Placeable.cs
Added GUI for placeables and components

Still need to make the "+" button work.
Revert "Added GUI for placeables and components"

This reverts commit 9a00020c27f2c651c07a83478d4fcde672571388.
Revert "Revert "Added GUI for placeables and components""

This reverts commit 440b38cd4d58a45bc72c0149f1bb0344214eab03.
Merge remote-tracking branch 'origin/master'

Conflicts:
	Editor/Editor.csproj
	Editor/MainWindow.xaml