Clean up of app.h

app.h, generated from app.h_in, has unnecessary code duplication
and isn't a header file (it defines globals, static functions
and doesn't have a header guard, moreover, it has a 'using namespace
std;'). Because of this, a real headerfile that declares the stuff
defined in apps.h was missing leading to even more code duplication:
scattered forward declarations in .cpp files and an often repeated
type of std::map<std::string, px4_main_t>.

This patch moves cmake/qurt/apps.h_in to src/platforms/apps.cpp.in
(with some changes) and removes cmake/posix/apps.h_in.
Then src/platforms/apps.cpp.in is split into src/platforms/apps.cpp.in
and src/platforms/apps.h.in, splitting declarations from definitions.

A typedef is defined for the map (apps_map_type).

The main difference between cmake/posix/apps.h_in and
cmake/qurt/apps.h_in was that the first defined a global 'apps',
while qurt stores the apps in QShell. I opted to get rid of
the global variable (which are in general evil for various reasons)
and used the API of cmake/qurt/apps.h_in where a provided 'apps'
map is initialized with a call to init_app_map. Thus removing
the existing code duplication.

src/firmware/posix/CMakeLists.txt

@@ -1,7 +1,7 @@
 include_directories(${CMAKE_CURRENT_BINARY_DIR})
 
 px4_posix_generate_builtin_commands(
-	OUT apps.h
+	OUT apps
 	MODULE_LIST ${module_libraries})
 
 if ("${BOARD}" STREQUAL "eagle" OR ("${BOARD}" STREQUAL "excelsior"))
@@ -19,7 +19,7 @@ if ("${BOARD}" STREQUAL "eagle" OR ("${BOARD}" STREQUAL "excelsior"))
 		SOURCES
 			px4muorb_stub.c
 			${PX4_SOURCE_DIR}/src/platforms/posix/main.cpp
-			apps.h
+			apps.cpp
 		LINK_LIBS
 			-Wl,--start-group
 			${module_libraries}
@@ -41,7 +41,7 @@ elseif ("${BOARD}" STREQUAL "rpi")
 
 	px4_add_executable(px4
 		${PX4_SOURCE_DIR}/src/platforms/posix/main.cpp
-		apps.h
+		apps.cpp
 		)
 
 	target_link_libraries(px4
@@ -68,7 +68,7 @@ elseif ("${BOARD}" STREQUAL "bebop")
 
 	px4_add_executable(px4
 		${PX4_SOURCE_DIR}/src/platforms/posix/main.cpp
-		apps.h
+		apps.cpp
 		)
 
 	if (NOT APPLE)
@@ -98,7 +98,7 @@ else()
 
 	px4_add_executable(px4
 		${PX4_SOURCE_DIR}/src/platforms/posix/main.cpp
-		apps.h
+		apps.cpp
 		)
 
 	if (NOT APPLE)

src/firmware/qurt/CMakeLists.txt

@@ -9,7 +9,7 @@ include_directories(${CMAKE_CURRENT_BINARY_DIR})
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wno-missing-prototypes")
 
 px4_qurt_generate_builtin_commands(
-	OUT ${PX4_BINARY_DIR}/apps.h
+	OUT ${PX4_BINARY_DIR}/apps
 	MODULE_LIST ${module_libraries})
 
 FASTRPC_STUB_GEN(px4muorb.idl)
@@ -23,7 +23,7 @@ if ("${QURT_ENABLE_STUBS}" STREQUAL "1")
                 )
 	add_executable(px4
 		${PX4_BINARY_DIR}/src/firmware/qurt/px4muorb_skel.c
-		${PX4_BINARY_DIR}/apps.h)
+		${PX4_BINARY_DIR}/apps.cpp)
 
 	target_link_libraries(px4
 		-Wl,--start-group
@@ -42,7 +42,7 @@ else()
 	QURT_LIB(LIB_NAME px4
 		IDL_NAME px4muorb
 		SOURCES
-			${PX4_BINARY_DIR}/apps.h
+			${PX4_BINARY_DIR}/apps.cpp
 		LINK_LIBS
 			${module_libraries}
 			${target_libraries}