Qt5 built in qwt (#570)

- qt4->qt5
- in built qt5 6.1.5 because rhel7 is not upto date with qt5, removed findqwt.cmake
- made a fix in qwt lib (qwt_plot_layout.h) to work with 5.15 and lower versions for qrect constr.
- qt5 forms fixed, qt4 many hard coding forms switched to forms including qtabwidget, scrolls etc, fonts moved to forms
 - docking option enabled by default, removed option to disable docking feature from "Mode"
- added qVersionResolve utility functions to handle compatibility before and after qt5.12
- qtplots (ian's code) takes in gain mode enable to set some settings within the class, with proper gain plot ticks
- ensure gain plots have no zooming of z axis in 2d and y axis in 1d
- removed placeholder text in qpalette in main window form as its not supportd until 5.12 (so using qt5.9 designer insted of qt5.15 to cope)
- tab order
Servers:
- fixed some error messages that were empty for fail in funcs (mostly minor as if this error, major issues)

libs/qwt-6.1.5/doc/html/inherit_graph_1.map

@@ -0,0 +1,7 @@
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+<area shape="rect" id="node2" href="$class_qwt_round_scale_draw.html" title="A class for drawing round scales." alt="" coords="213,5,364,32"/>
+<area shape="rect" id="node4" href="$class_qwt_scale_draw.html" title="A class for drawing scales." alt="" coords="233,56,345,83"/>
+<area shape="rect" id="node3" href="$class_qwt_compass_scale_draw.html" title="A special scale draw made for QwtCompass." alt="" coords="412,5,583,32"/>
+<area shape="rect" id="node5" href="$class_qwt_date_scale_draw.html" title="A class for drawing datetime scales." alt="" coords="427,56,568,83"/>
+</map>