Improved Mac OS packaging + fixed compiler warnings

- Generated Mac OS compatible icon
  - ```sips -s format icns CasterSoundboard.png --out CasterSoundboard.icns```
- Updated CasterSoundboard.pro
  - App bundle installs in ~/Applications by default
  - Use previously generated icon in bundle
- Fix "using integer absolute value function 'abs' when argument is of floating point type"
  - switched to cmath lib and import abs function
- Fix "variable 'h' is used uninitialized whenever switch default is taken"
  - switch default sets h to 0

CasterSoundboard/CSS.cpp

@@ -21,9 +21,11 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  */
 #include "CSS.h"
-#include <math.h>
+#include <cmath>
 #include <QString>
 
+using std::abs;
+
 QString Generate_CSS(HSL_C hsl_color)
 {
     RGB_C rgb_color = RGB_C(0,0,0);
@@ -270,6 +272,7 @@ HSL_C::HSL_C(RGB_C rgb_color)
                 h = 60 * ( ( r - g ) / d + 4.0 );
                 break;
             default:
+                h = 0.0;
                 break;
         }
     }

CasterSoundboard/CasterSoundboard.pro

@@ -4,11 +4,21 @@
 #
 #-------------------------------------------------
 
-isEmpty(PREFIX) {
-    PREFIX = /usr/local
+linux {
+    isEmpty(PREFIX) {
+        PREFIX = /usr/local
+    }
+    BINDIR = $$PREFIX/bin
+    DATADIR = $$PREFIX/share
+}
+
+macx {
+    isEmpty(PREFIX) {
+        PREFIX = ~
+    }
+    BINDIR = $$PREFIX/Applications
+    DATADIR = $$PREFIX/Library/Application\ Support/CasterSoundboard
 }
-BINDIR = $$PREFIX/bin
-DATADIR = $$PREFIX/share
 
 CONFIG += c++11
 QT += core gui multimedia network
@@ -144,5 +154,9 @@ linux {
     INSTALLS += appdata desktop pixmap
 }
 
+macx {
+    ICON = ../dist/macos/CasterSoundboard.icns
+}
+
 target.path = $$BINDIR
 INSTALLS += target