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/search/functions_c.js

@@ -0,0 +1,12 @@
+var searchData=
+[
+  ['needle_2173',['needle',['../class_qwt_dial.html#a6926445d799b363de728615854623d9e',1,'QwtDial::needle() const'],['../class_qwt_dial.html#abbf494e72f6244e4ec88211354c739a4',1,'QwtDial::needle()']]],
+  ['normalized_2174',['normalized',['../class_qwt_interval.html#a1d6e04b4c2c8e7fb513fbedd2f8984a6',1,'QwtInterval::normalized()'],['../class_qwt_point_polar.html#aab6516a84d4e0a5850f26e4dbaaad0c8',1,'QwtPointPolar::normalized()']]],
+  ['num_2175',['num',['../class_qwt_arrow_button.html#a680ecdc99fdc5971ddfabc643e1ed52a',1,'QwtArrowButton']]],
+  ['numbuttons_2176',['numButtons',['../class_qwt_counter.html#ab7aa5fbf0041f6e1d99c1ceafbc8bb10',1,'QwtCounter']]],
+  ['numcolumns_2177',['numColumns',['../class_qwt_dyn_grid_layout.html#a773d577c8abcb959dc41c22a6afc5ce7',1,'QwtDynGridLayout::numColumns()'],['../class_qwt_matrix_raster_data.html#ab6c21de8fd8945b634624774f3b3d85b',1,'QwtMatrixRasterData::numColumns()']]],
+  ['numrows_2178',['numRows',['../class_qwt_dyn_grid_layout.html#a912f31757155f2a7573a8e2076d248b8',1,'QwtDynGridLayout::numRows()'],['../class_qwt_matrix_raster_data.html#aca86a73cc956acce6edd9731482ccc11',1,'QwtMatrixRasterData::numRows()']]],
+  ['numthornlevels_2179',['numThornLevels',['../class_qwt_simple_compass_rose.html#a6ea00a06b07d87798e2630b489fb619e',1,'QwtSimpleCompassRose']]],
+  ['numthorns_2180',['numThorns',['../class_qwt_simple_compass_rose.html#a2c4df8d87a99b4e84e077773bf60956c',1,'QwtSimpleCompassRose']]],
+  ['numturns_2181',['numTurns',['../class_qwt_knob.html#addd1efaa458d378b07d2ce1699930595',1,'QwtKnob']]]
+];