Added custom Info.plist to SPIERSview for macOS

macOS file associations are done through the Info.plist files under the application pakages. QT/qmake should be able to overwrite the default generated file with this custom file. Need to make sure that the custom Info.plist (below) is in XML format and not binary as qmake uses sed for string replacements within it.

SPIERSview/Info.plist

@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleExecutable</key>
+	<string>SPIERSview64</string>
+	<key>CFBundleIconFile</key>
+	<string>SPIERSviewIcon.icns</string>
+	<key>CFBundleIdentifier</key>
+	<string>com.yourcompany.SPIERSview64</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>LSMinimumSystemVersion</key>
+	<string>10.13</string>
+	<key>NOTE</key>
+	<string>This file was generated by Qt/QMake.</string>
+	<key>NSPrincipalClass</key>
+	<string>NSApplication</string>
+	<key>NSSupportsAutomaticGraphicsSwitching</key>
+	<true/>
+        <key>CFBundleTypeRole</key>
+        <string>Editor</string>
+        <key>CFBundleTypeExtensions</key>
+        <array>
+            <string>spv</string>
+            <string>vaxml</string>
+        </array>
+        <key>CFBundleTypeMIMETypes</key>
+        <string>application/octet-stream</string>
+        <key>CFBundleTypeName</key>
+        <string>SPIERSview</string>
+</dict>
+</plist>

SPIERSview/SPIERSview.pro

@@ -219,7 +219,7 @@ unix:!macx {
 # MacOS common build here
 macx {
 
-     #RJG - Below vtk installation achieved using installation via homebrew
+     #Below vtk installation achieved using installation via homebrew
      #eg. brew install vtk
      LIBS += -L$$PWD/../../../../../../usr/local/Cellar/vtk/8.2.0_10/lib/ \
     -lvtkCommonExecutionModel-8.2.1 \
@@ -303,14 +303,20 @@ macx {
      INCLUDEPATH += $$PWD/../../../../../../usr/local/Cellar/vtk/8.2.0_10/include/vtk-8.2/
      DEPENDPATH += $$PWD/../../../../../../usr/local/Cellar/vtk/8.2.0_10/include/vtk-8.2/
 
-    #RJG - Note also the virtual machine has a VTK version built on the box:
+    # RJG - Note also the virtual machine has a VTK version built on the box:
     #LIBS += -L$$PWD/../../../../SPIERS/VTK-8.2.0/build/lib/ \
     #INCLUDEPATH += $$PWD/../../../../SPIERS/VTK-8.2.0/build
     #DEPENDPATH += $$PWD/../../../../SPIERS/VTK-8.2.0/build
-    #I have left this in case an alternative is ever required
+    # I have left this in case an alternative is ever required
 
-    #Mac icon
+    # Mac icon
     ICON = resources/SPIERSviewIcon.icns
+
+    # macOS file associations are done through the Info.plist files under the application pakages
+    # QT/qmake should be able to overwrite the default generated file with this custom file
+    # We need to make sure that the custom Info.plist (below) is in XML format and not binary
+    # as qmake uses sed for string replacements within it.
+    QMAKE_INFO_PLIST = Info.plist
 }
 
 SOURCES += src/main.cpp \