Core/Scripts: Split script subdirectories into independent modules

* Makes it possible to define the linkage for every module
* Move the ScriptPCH into the root directory
* Changes the SCRIPTS cmake variable to a string type:
  -> -DSCRIPTS=0 is -DSCRIPTS="minimal-static" now
     (builds commands and spells statically)
  -> -DSCRIPTS=1 is -DSCRIPTS="static" now
     (builds all modules statically)
  -> -DSCRIPTS="dynamic"
     (builds all modules dynamically)
  -> Also the default value which is provided by the SCRIPTS
     variable is overwriteable through the SCRIPTS_COMMANDS,
     SCRIPTS_SPELLS... variable.

cmake/showoptions.cmake

@@ -23,9 +23,8 @@ else()
   message("* Build world/authserver : No")
 endif()
 
-if( SCRIPTS )
-  message("* Build with scripts     : Yes (default)")
-  add_definitions(-DSCRIPTS)
+if(SCRIPTS AND (NOT SCRIPTS STREQUAL "none"))
+  message("* Build with scripts     : Yes (${SCRIPTS})")
 else()
   message("* Build with scripts     : No")
 endif()
@@ -70,7 +69,7 @@ else()
 endif()
 
 if( NOT WITH_SOURCE_TREE STREQUAL "no" )
-  message("* Show source tree       : Yes - \"${WITH_SOURCE_TREE}\"")
+  message("* Show source tree       : Yes (${WITH_SOURCE_TREE})")
 else()
   message("* Show source tree       : No")
 endif()
@@ -87,7 +86,7 @@ if ( WITHOUT_GIT )
   message(" *** version of git for the revision-hash to work, and be allowede to ask for")
   message(" *** support if needed.")
 else()
-  message("* Use GIT revision hash  : Yes")
+  message("* Use GIT revision hash  : Yes (default)")
 endif()
 
 if ( NOJEM )
@@ -113,14 +112,15 @@ if ( HELGRIND )
   add_definitions(-DHELGRIND)
 endif()
 
-if (WITH_DYNAMIC_LINKING)
+if (BUILD_SHARED_LIBS)
   message("")
   message(" *** WITH_DYNAMIC_LINKING - INFO!")
   message(" *** Will link against shared libraries!")
   message(" *** Please note that this is an experimental feature!")
+  if (WITH_DYNAMIC_LINKING_FORCED)
+    message("")
+    message(" *** Dynamic linking was enforced through a dynamic script module!")
+  endif()
   add_definitions(-DTRINITY_API_USE_DYNAMIC_LINKING)
-  set(BUILD_SHARED_LIBS ON)
-else()
-  set(BUILD_SHARED_LIBS OFF)
 endif()
 message("")