Fixes detected by cppcheck (#4974)

* Janitor : Remove obsolete pointer to dialog

* Janitor : Remove unused functions

* Janitor : Remove unused functions

* Janitor : Add explicit to constructors

* Janitor : Remove unused variables

* Janitor : Remove unused functions related to summary plot templates

* clang-tidy : Use nullptr instead of 0

* clang-tidy : Fix usage of virtual and override

* Upped to version 2019.08.2-dev.05

* Janitor : Remove unused variables

* Janitor : Clean up several cppcheck issues

* Janitor : Add cppcheck config files

* Janitor : Use const when possible

scripts/ResInsightApplicationCode.cppcheck

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="1">
+    <builddir>ResInsightApplicationCode-cppcheck-build-dir</builddir>
+    <platform>win64</platform>
+    <analyze-all-vs-configs>false</analyze-all-vs-configs>
+    <check-headers>true</check-headers>
+    <check-unused-templates>false</check-unused-templates>
+    <max-ctu-depth>10</max-ctu-depth>
+    <paths>
+        <dir name="../ApplicationCode"/>
+    </paths>
+    <libraries>
+        <library>googletest</library>
+        <library>opengl</library>
+        <library>qt</library>
+    </libraries>
+</project>