preludes: move to vlib/v/preludes

vlib/v/builder/compile.v

@@ -223,7 +223,7 @@ pub fn (v &Builder) get_user_files() []string {
 	mut user_files := []string{}
 	// See cmd/tools/preludes/README.md for more info about what preludes are
 	vroot := os.dir(pref.vexe_path())
-	preludes_path := os.join_path(vroot, 'cmd', 'tools', 'preludes')
+	preludes_path := os.join_path(vroot, 'vlib', 'v', 'preludes')
 	if v.pref.is_livemain || v.pref.is_liveshared {
 		user_files << os.join_path(preludes_path, 'live.v')
 	}

vlib/v/preludes/README.md

@@ -1,28 +1,28 @@
 # V preludes:
 
-The cmd/tools/preludes/ contains small v code snippets, that V uses when 
+The vlib/v/preludes/ contains small v code snippets, that V uses when 
 compiling certain v programs. V adds the files below automatically itself.
 Each file is used in different situations (see below).
 
 NB: preludes are *NOT* intended to be used by user programs/modules.
-The folder cmd/tools/preludes/ is *NOT* a v module.
+The folder vlib/v/preludes/ is *NOT* a v module.
 
 ## Details:
 
-### cmd/tools/preludes/live_main.v
+### vlib/v/preludes/live_main.v
 Used when compiling live programs. This file is used by the main executable
 live program, that starts the file change monitoring thread. Each live program
 needs module `os` and module `time`, in order for the background file change 
 monitoring thread to work properly.
 
-### cmd/tools/preludes/live_shared.v
+### vlib/v/preludes/live_shared.v
 Used when compiling live programs, for the shared library portion of the live 
 programs, that is reloaded each time the code is changed.
 
-### cmd/tools/preludes/tests_assertions.v  
+### vlib/v/preludes/tests_assertions.v  
 Used when compiling `_test.v` programs. 
 It specifies how failed assertions will look.
 
-### cmd/tools/preludes/tests_with_stats.v
+### vlib/v/preludes/tests_with_stats.v
 Used when compiling `_test.v` programs with -stats option. 
 It specifies how the result will appear ('assert' vs 'asserts' and so on).