MultiPointTouchArea: handles mouse too, unless mouseEnabled is false

A new boolean property mouseEnabled is introduced (true by default).
If set to true, then it will handle any non-synthetic mouse event
as if it were a touch point.
If set to false, the area becomes transparent for real mouse events
so that a MultiPointTouchArea can be stacked on top of a MouseArea
in order to separate handling of touch and mouse.
In either case it continues to absorb and ignore synthesized mouse
events (including touch-to-mouse synthesis in QQuickWindow).

[ChangeLog][QtQuick][MultiPointTouchArea]handles mouse as a touchpoint;
added mouseEnabled property to permit transparent pass-through to
mouse-sensitive items

Change-Id: I4af94d838f0060154494589c0f15c6858ee89ddb
Task-number: QTBUG-31047
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>
Remove several uses of module includes

Module includes are discouraged because they may increase compilation
time. While debugging a broken core module include header, a number
of module include infractions were discovered in qtdeclarative. Replace
them with their more specific counterparts.

Change-Id: I614e9a6aa2177f396e5289f3cdb3c35faa0202c9
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>
Fix TextEdit::lineCount to update as appropriate

The total line count needs to be updated when geometry,
document size or wrapping mode changes.

Task-number: QTBUG-37263
Change-Id: If58a2f77022475e8bcb7cca0f2a091ee837b39a5
Reviewed-by: Pierre Rossi <pierre.rossi@gmail.com>
Reviewed-by: Caroline Chao <caroline.chao@digia.com>