Buildscript and kernel improvements (#280)

- Implemented `constexpr long int getMicros()` in `Kernel.h`
- Changed `secondsToTicks()`, `minutesToTicks()` and `bool isIsr()` to `constexpr`
- Added more relevant build info

Buildscripts/board.cmake

@@ -1,3 +1,12 @@
+if (NOT WIN32)
+    string(ASCII 27 Esc)
+    set(ColorReset "${Esc}[m")
+    set(Cyan "${Esc}[36m")
+else ()
+    set(ColorReset "")
+    set(Cyan "")
+endif ()
+
 function(INIT_TACTILITY_GLOBALS SDKCONFIG_FILE)
     get_filename_component(SDKCONFIG_FILE_ABS ${SDKCONFIG_FILE} ABSOLUTE)
     # Find the board identifier in the sdkconfig file
@@ -10,7 +19,7 @@ function(INIT_TACTILITY_GLOBALS SDKCONFIG_FILE)
     set(id_length 0)
     math(EXPR id_length "${sdkconfig_board_id_length} - 21")
     string(SUBSTRING ${sdkconfig_board_id} 20 ${id_length} board_id)
-    message("Building board ${board_id}")
+    message("Building board: ${Cyan}${board_id}${ColorReset}")
 
     if (board_id STREQUAL "cyd-2432s024c")
         set(TACTILITY_BOARD_PROJECT CYD-2432S024C)
@@ -53,7 +62,7 @@ function(INIT_TACTILITY_GLOBALS SDKCONFIG_FILE)
     if (TACTILITY_BOARD_PROJECT STREQUAL "")
         message(FATAL_ERROR "No subproject mapped to \"${TACTILITY_BOARD_ID}\" in root Buildscripts/board.cmake")
     else ()
-        message("Board project: Boards/${TACTILITY_BOARD_PROJECT}")
+        message("Board project: ${Cyan}Boards/${TACTILITY_BOARD_PROJECT}${ColorReset}\n")
         set_property(GLOBAL PROPERTY TACTILITY_BOARD_PROJECT ${TACTILITY_BOARD_PROJECT})
         set_property(GLOBAL PROPERTY TACTILITY_BOARD_ID ${board_id})
     endif ()