Add simple calculator app

Having a calculator is always handy and calculator watches are cool.
Seems like this PR from minacode is in a good state and about to be merged upstream.

Author: dariusarnold

src/CMakeLists.txt

@@ -380,6 +380,7 @@ list(APPEND SOURCE_FILES
         displayapp/screens/Metronome.cpp
         displayapp/screens/Motion.cpp
         displayapp/screens/Weather.cpp
+        displayapp/screens/Calculator.cpp
         displayapp/screens/FirmwareValidation.cpp
         displayapp/screens/ApplicationList.cpp
         displayapp/screens/Notifications.cpp

src/displayapp/DisplayApp.cpp

@@ -30,6 +30,7 @@
 #include "displayapp/screens/Weather.h"
 #include "displayapp/screens/PassKey.h"
 #include "displayapp/screens/Error.h"
+#include "displayapp/screens/Calculator.h"
 
 #include "drivers/Cst816s.h"
 #include "drivers/St7789.h"

src/displayapp/apps/Apps.h.in

@@ -26,6 +26,7 @@ namespace Pinetime {
       StopWatch,
       Metronome,
       Motion,
+      Calculator,
       Steps,
       Dice,
       Weather,

src/displayapp/apps/CMakeLists.txt

@@ -13,6 +13,7 @@ else ()
     set(DEFAULT_USER_APP_TYPES "${DEFAULT_USER_APP_TYPES}, Apps::Dice")
     set(DEFAULT_USER_APP_TYPES "${DEFAULT_USER_APP_TYPES}, Apps::Metronome")
     set(DEFAULT_USER_APP_TYPES "${DEFAULT_USER_APP_TYPES}, Apps::Navigation")
+    set(DEFAULT_USER_APP_TYPES "${DEFAULT_USER_APP_TYPES}, Apps::Calculator")
     set(DEFAULT_USER_APP_TYPES "${DEFAULT_USER_APP_TYPES}, Apps::Weather")
     #set(DEFAULT_USER_APP_TYPES "${DEFAULT_USER_APP_TYPES}, Apps::Motion")
     set(USERAPP_TYPES "${DEFAULT_USER_APP_TYPES}" CACHE STRING "List of user apps to build into the firmware")

src/displayapp/fonts/fonts.json

@@ -7,7 +7,7 @@
          },
          {
             "file": "FontAwesome5-Solid+Brands+Regular.woff",
-            "range": "0xf294, 0xf242, 0xf54b, 0xf21e, 0xf1e6, 0xf017, 0xf129, 0xf03a, 0xf185, 0xf560, 0xf001, 0xf3fd, 0xf1fc, 0xf45d, 0xf59f, 0xf5a0, 0xf027, 0xf028, 0xf6a9, 0xf04b, 0xf04c, 0xf048, 0xf051, 0xf095, 0xf3dd, 0xf04d, 0xf2f2, 0xf024, 0xf252, 0xf569, 0xf06e, 0xf015, 0xf00c, 0xf0f3, 0xf522, 0xf743"
+            "range": "0xf294, 0xf242, 0xf54b, 0xf21e, 0xf1e6, 0xf017, 0xf129, 0xf03a, 0xf185, 0xf560, 0xf001, 0xf3fd, 0xf1fc, 0xf45d, 0xf59f, 0xf5a0, 0xf027, 0xf028, 0xf6a9, 0xf04b, 0xf04c, 0xf048, 0xf051, 0xf095, 0xf3dd, 0xf04d, 0xf2f2, 0xf024, 0xf252, 0xf569, 0xf06e, 0xf015, 0xf00c, 0xf0f3, 0xf522, 0xf743, 0xf1ec, 0xf55a"
          }
       ],
       "bpp": 1,