Allow user to influence geometry hints resize behaviour

For the longest time weltschmerz has defaulted to passing width_inc and
height_inc to set_geometry_hints, making it such that the window can
only be resized in increments of the cell size. Whilst this is
advantageous with floating windows, once weltschmerz is forced into a
specific geometry (e.g. when put into a tiling context), the window
manager or compositor will have to accept weltschmerz's geometry hints
and make the window smaller than the space allotted for it.

Since some people care about pixel-perfect alignment for their tiled
windows, make this behaviour controllable by introducing a new
'resize-hints' setting. To remain backwards-compatible, this setting is
true by default, but when switched off, weltschmerz will stop setting
the width_inc and height_inc geometry hints, making it freely resizable
by adding dynamic padding around the terminal's viewport.

Co-authored-by: Juhani Krekelä <juhani@krekelä.fi>

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