native-code: Remove not used base and math groups.

Change-Id: Ic1c6109ff9463add24c879cf6e6371ab050831d0
native-code: Remove foo_core groups, now only 'core' and 'writer' are used.

Also remove extended_core group. If something from there will be
needed, we will add it another way.
Currently only android/experimental/desktop/Makefile and
ios/CustomTarget_TiledLibreOffice_app.mk are known to do something.

Change-Id: I99936075e35ce98d684581838c0a19dccd83f942
Add components needed for editing a document in android/desktop app.

As new 'edit' group because they are not needed in view-only
TiledLibreOffice_app. Although, probably there are more components
in 'core' which should be in 'edit' too, who knows, sigh.

Change-Id: I1efebc9884662a5d25744a3414717aa410350ef4