Signed-off-by: falkTX <falktx@gmail.com>

* patchcanvas: Working Ctrl for rubberband selection

* patchcanvas: optimize calls in zoom-fit

* patchcanvas: optimize fixScaleFactors

* patchcanvas: speedup zoom_in/zoom_out

* patchcanvas: disconnect ports by Ctrl+MidButton

* patchcanvas: optimize rubberband update

* patchcanvas: correct cursor unset

* fixScaleFactor: support transform argument

* patchcanvas: speedup wheelEvent handler

Direct operations on QTransform go faster than via QGraphicsView
convenience methods.

* patchcanvas: optimize QPointF construction

* patchcanvas: Сursor for connection cut mode

* patchcanvas: rubberband scaling support

* patchcanvas: Limit top scale by canvas size

* patchcanvas: Fix box position after each movement, even creation

* minimap: Scaling support

Pressing RMB after LMB activates special scaling mode. Scroll wheel to
scale in any mode or without such.

* patchcanvas: Take port lineHinting from chosen pen

* patchcanvas: Set default port offset to 0px

Besides of more tidy look with certain themes, it also noticed to be
workaround for problem, when connection lines get under port's parent
box, after selection changes.

* patchcanvas: Finer connection placement relative to ports

* minimap: Update on any selection change

For now minimap is already updated when box (not port) is selected.
Also it will update if port is selected by Ctrl+C while box is already
selected. This commit just makes this behavior more stable and
predictable,

* minimap: Align frame bottom with canvas frame

* minimap: Fixed & unified cursor pos expressions

Another approach, yet working in both places without rewriting.
Don't add xp or yp, as it displaces right/bottom limit by 1px

* minimap: Better custom frame

New implementation has outer 1px shadow above parent background
and internal enlight border above background. All is pixel-aligned.

* minimap: Fix cursor position on lowest scale

When scale is close to 0.2, view area may become bigger than working
area. After such "fix" viewRect position is broken.

* minimap: Brightness-aware shading on side gaps

* mininap: Set viewRect lineHinting from proper pen

* minimap: Cliped rendering for rounded corners

* minimap: Frame width awareness

Draw content only inside frame when external qt theme is used.

* minimap: Implement full resize with any ratio

* minimap: Better cursor positioning

* minimap: Minimal corner rounding

Make rounding to look good with rounded frames, still not ugly
with square themes.

* minimap: Reworked frame

Mimic tab frame by placing existing frame as line child to QTabWidget.
Frame derivation still handy to create inner sunken frame, just like
in two other frames around.

* minimap-framewidth: Follow system style change

* minimap: Special blending modes for view cursor

Adding for dark color schemes and subtracting for light preserve more
contrast, compared to default blending. Difference is calculated from
background and rubberband colors.

* Better buttons look in sidebar fileview

* minimap: Hold cursor inside map in view move mode

* minimap: Natural move

Would be more natural to have centered position in canvas view, when
pointed in minimap.

Same as for main canvas - 2d cursor is aligned to pixels. Visible
difference is different look of antialiased map itself.