RD-3: Implemented M_LoadDefaults. Also add d_strings, giving supprot for English default strings

DEFAULT.CFG

@@ -0,0 +1,46 @@
+mouse_sensitivity		5
+sfx_volume		8
+music_volume		8
+show_messages		1
+key_right		77
+key_left		75
+key_up		72
+key_down		80
+key_strafeleft		51
+key_straferight		52
+key_fire		29
+key_use		57
+key_strafe		56
+key_speed		54
+use_mouse		1
+mouseb_fire		0
+mouseb_strafe		1
+mouseb_forward		2
+use_joystick		0
+joyb_fire		0
+joyb_strafe		1
+joyb_use		3
+joyb_speed		2
+screenblocks		9
+detaillevel		0
+showmessages		1
+comport		1
+snd_channels		8
+snd_musicdevice		4
+snd_sfxdevice		3
+snd_sbport		544
+snd_sbirq		7
+snd_sbdma		1
+snd_mport		-1
+usegamma		0
+chatmacro0		"no macro"
+chatmacro1		"no macro"
+chatmacro2		"no macro"
+chatmacro3		"no macro"
+chatmacro4		"no macro"
+chatmacro5		"no macro"
+chatmacro6		"no macro"
+chatmacro7		"no macro"
+chatmacro8		"no macro"
+chatmacro9		"no macro"
+		0