Revert "Project: Set QML/C++ languages where both are possible"

This reverts commit 75691393ec9bf87c290fb8e9d199cbeab7e726f8. Otherwise
we'd enable QML debugging for virtually all projects.

Change-Id: I5518624a9973a9f61fbef6c680b5a83c74d0b4a9
Reviewed-by: Aurindam Jana <aurindam.jana@digia.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
QmlProject: Unify use of constants

Change-Id: I7397eb12f46e1c0a175b6bcec794b3e8ad1cb19a
Reviewed-by: Aurindam Jana <aurindam.jana@digia.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Debugger: Don't check for QML language before project is parsed

Checking for QMLJS in the ctor of the aspect always returns false
for qt4project, since the project hasn't been parsed yet.

Change-Id: I41ce057bda4a1f2cb700e655645eae627990f3be
Reviewed-by: Aurindam Jana <aurindam.jana@digia.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>