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/searchdata.js

@@ -0,0 +1,36 @@
+var indexSectionsWithContent =
+{
+  0: "abcdefghijklmnopqrstuvwxyz~",
+  1: "kmq",
+  2: "abcdefghiklmnopqrstuvwxyz~",
+  3: "bcdhiklmostv",
+  4: "abcdiloprst",
+  5: "abcdefhiklmoprstw",
+  6: "abcdefghijklmnoprstuvwxy",
+  7: "bcdioqsw"
+};
+
+var indexSectionNames =
+{
+  0: "all",
+  1: "classes",
+  2: "functions",
+  3: "variables",
+  4: "typedefs",
+  5: "enums",
+  6: "enumvalues",
+  7: "pages"
+};
+
+var indexSectionLabels =
+{
+  0: "All",
+  1: "Classes",
+  2: "Functions",
+  3: "Variables",
+  4: "Typedefs",
+  5: "Enumerations",
+  6: "Enumerator",
+  7: "Pages"
+};
+