Defines starting with `e' in heretic

• E1TEXT src/dstrings.bak:257
• E2TEXT src/dstrings.bak:274
• E3TEXT src/dstrings.bak:292
• E4TEXT src/dstrings.bak:311
• E5TEXT src/dstrings.bak:333
• EBT_CENTERVIEW src/doomdef.h:938
• EBT_FIRE src/doomdef.h:929
• EBT_FLYDROP src/doomdef.h:937
• EBT_INVENTORYLEFT src/doomdef.h:934
• EBT_INVENTORYRIGHT src/doomdef.h:935
• EBT_MAP src/doomdef.h:933
• EBT_OPENDOOR src/doomdef.h:930
• EBT_PAUSE src/doomdef.h:939
• EBT_SPEED src/doomdef.h:931
• EBT_STRAFE src/doomdef.h:932
• EBT_USEARTIFACT src/doomdef.h:936
• EBT_WEAPONCYCLE src/doomdef.h:940
• EMPTYSTRING src/dstrings.bak:38
• ENDGAME src/dstrings.bak:29