add an explicit log level getter/setter to QgsProcessingContext which
algorithms can use to determine an appropriate level of feedback
to push to users.
Initially the verbose log only triggers the full verbose output
of model executions (which is also used when running models through
the model designer), but the intention is that more algorithms
will fine tune their output based on the logging level.
qgis_process also gains a new --verbose switch to enable verbose
log output.
+ Run button is not shown anymore in the Log tab, therefore, you can only run algorithms from the Parameters tab.
+ While running an algorithm, the Parameters tab is now blocked.
+ When an algorithm execution finishes (either successfully or not), a new button Change Parameters is shown in the Log tab.
+ The Batch Algorithm Dialog is now consistent with the described behavior (before, it blocked the Parameters panel, but not the tab; and it was the only dialog blocking parameters widgets).
These changes were applied to the Algorithm Dialog and Batch Algorithm Dialog, and work on Edit in place dialogs as well.
