qdoc: Remove all collision node stuff from qdoc

Now that the qdoc link command has ability to tell qdoc which module
contains a link target or whether to link to a QML or CPP entity,
collision pages should no longer be necessary. In fact, qdoc hasn't
been generating any collisions for some time. This task removes all
the collision node code from qdoc.

Task-number: QTBUG-40506
Change-Id: I34d1980ca1c0fe4bb5ad27dd4b00e61fa7e6e335
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
qdoc: Add new checkForCollision()

But don't use it yet. qdoc will check for name
collisions within a module, once we decide what
collisions to look for and what to do about them.
This change puts a rewritten checkForCollision()
function back in, but doesn't use it yet.

Change-Id: I41f9275c3ca29f228268ccf7cb2d99bbe0ce557c
Task-number: QTBUG-40506
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
qdoc: Report error in square bracket parameter

This update makes qdoc report an error, when it can't
recognize a parameter in square brackets.

Change-Id: I45d31ec875ac533736ee4a565ff3f217353068dd
Task-number: QTBUG-39221
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
qdoc: Fix a few cases for '[ ... ]' linking

This update fixes a few cases that didn't work
correctly. The problem was caused by calling
findNodeForTarget() with a pointer to a relative
node, but the relative node pointer should always
be 0, when the domain tree to be searched is not
the same as the tree containing the relative node.
This fix sets the relative node pointer to 0 in
that case.

Change-Id: I2fe4a7a4a3b6392199666c7d49b473a56697e7b5
Task-number: QTBUG-39221
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Incorporate fixes from QQmlAnimationTimer into QAnimationTimer.

Incorporates animation timer fixes in:
  * 7da483bfbefcaabb1dbbf3e2f1d5b5f7aadc3b06
  * b02eeeee586abe343b8866385c1327ac009b3ef0
  * 59d5c5cf555a51cd7559cea197a198ef3a792614
from qtdeclarative.

With these changes, we no longer need to call updateAnimationTimers
in QUnifiedTimer::startTimers.

Change-Id: Ic24501cfdc3cb572bd891d84f684f11c3bef1b50
Reviewed-by: Gunnar Sletta <gunnar.sletta@jollamobile.com>