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This time, ensure that the grid is increased and the main form gets an
event

When the grid editor is shown, we also want to ensure that the grid gets
resized to account for the new editor.  Queuing the event will ensure
that happens after the editor is emplaced in the grid

Fixes #5690

(cherry picked from commit fddfce4f)

(cherry picked from commit ab184ba9)

This ensures that irreflexivity is given in sort ordering.  This may
have been triggering issues in MacOS when adding sheets

Fixes #10557

(cherry picked from commit a1615cce)

On GTK, the full editor needs to be shown and, for some systems, the
editor will not show correctly.  By yielding we should allow the time to
recalculate sizes for the editor in the grid

Fixes #5690

(cherry picked from commit 871556eb)

Originally written by Tarun Johar.

Fixes: #8426

Needs an icon at some point

Preparing also for a third usage where we autodetect the file type

Attempting to print this as a char was causing wxWidgets to assert since
some input is neither ASCII or valid UTF-8.

Reproducable by trying to open zip files as gerber files from the
command line.

Also parse other extensions, and use new heuristics to guess if we don't
know the extension.

Fixes: #5680

Since we now load into the next available layer, don't erase our current
layer.

Test parsing function transmogrified from gerbv 2.7.0. gEDA suite is GPL
2+ so should be license compatible with our GPL3.

Fixes: #1848

Fixes: #7855

Happened in 4ba3937f

Fixes #10405

(instead of item centers)

Fixes #9233

Layers not in the given order are drawn behind everyone else.  Missing
the text prevents global labels from showing properly in GAL order

Fixes #10546

(cherry picked from commit f12d0cb0)

Fixes #10568
#10568