(svn r127) New feature: ingame console. (sign_de)

Press tab to open the console, more info in docs/console.txt

docs/console.txt

@@ -0,0 +1,46 @@
+OPENTTD INGAME CONSOLE DOCUMENTATION
+====================================
+
+HOTKEY: TAB
+
+COMMANDS:
+---------
+
+list_cmds [filter]
+list_vars [filter]
+echo [string]
+echoc [color-code] [string]
+printf [formatstring] [var] [var] [var]....
+printfc [color-code] [formatstring] [var] [var] [var]....
+screenshot ["big"]
+debug_level [0-9]
+exit
+
+
+VARIABLES:
+----------
+*developer
+-> 0 = no output
+-> 1 = console error output [like command not found]
+-> 2 = console error and debug output
+
+*cursor_rate
+-> 1-12 = defines the cursor blink interval 
+
+
+VARIABLE HANDLING:
+------------------
+
+*developer = 0
+*developer ++
+
+*temp_string = test
+*temp_string = "my little"
+
+printf "%s world" *temp_string
+
+
+---------------------------------------------------
+feel free to add more commands and use this in-game
+console for your debugging / enhancements
+