Base Frame on WeakComponentImplHelper instead of TransactionManager

...to get the deadlock under control the fix for which had to be reverted with
22fbbfe9 "Revert 'Avoid deadlock when two
threads call into Frame::close'".

Generally, replaced instances of TransactionGuard(E_HARDEXCEPTIONS) with
checkDisposed() and instances of TransactionGuard(E_SOFTEXCEPTIONS) with
nothing.  A TransactionGuard would not establish a locked section per se (only
would it engage in locking when TransactionManager::setWorkingMode is called,
see the deadlock mentioned above), so the potential for introducing new races
should be manageable.

While at it, get rid of those implcp_* "debug methods" used to SAL_WARN about
bad arguments to some UNO interface method implementations.

Change-Id: I5ea9c1c8b20fd38457c558dbcb3a853a51a09b6e