[lang] Remove backtracks from the grammar.

Backtracks make the parser less efficient, and the other tools may have
a partial behavior due to them, e.g. content assist.

see #406

Signed-off-by: Stéphane Galland <galland@arakhne.org>

eclipse-sarl/plugins/io.sarl.lang.ui/src-gen/io/sarl/lang/ide/contentassist/antlr/internal/InternalSARL.tokens

@@ -1,20 +1,20 @@
 '!'=83
 '!='=65
 '!=='=67
-'#'=119
+'#'=120
 '%'=82
 '%='=63
 '&&'=27
-'&'=134
-'('=91
-')'=92
+'&'=135
+'('=100
+')'=101
 '*'=79
 '**'=80
 '*='=61
 '+'=77
 '++'=84
 '+='=59
-','=90
+','=93
 '-'=78
 '--'=85
 '-='=60
@@ -24,8 +24,8 @@
 '..<'=72
 '/'=81
 '/='=62
-':'=89
-'::'=135
+':'=98
+'::'=136
 ';'=28
 '<'=70
 '<>'=75
@@ -35,83 +35,84 @@
 '=>'=74
 '>'=69
 '>='=68
-'?'=133
-'?.'=136
+'?'=134
+'?.'=137
 '?:'=76
-'@'=118
+'@'=119
 'AFTER'=48
 'BEFORE'=49
-'ELSE'=116
-'ELSEIF'=117
-'ENDFOR'=113
-'ENDIF'=115
-'FOR'=112
-'IF'=114
+'ELSE'=117
+'ELSEIF'=118
+'ENDFOR'=114
+'ENDIF'=116
+'FOR'=113
+'IF'=115
 'SEPARATOR'=50
-'['=97
-']'=98
+'['=105
+']'=106
 'abstract'=34
-'agent'=104
+'agent'=94
 'annotation'=47
-'as'=109
-'behavior'=106
-'capacity'=105
-'case'=123
-'catch'=132
+'as'=110
+'behavior'=95
+'capacity'=92
+'case'=124
+'catch'=133
 'class'=52
 'create'=46
 'def'=44
-'default'=111
+'default'=112
 'dispatch'=36
-'do'=125
-'else'=122
+'do'=126
+'else'=123
 'enum'=53
-'event'=103
+'event'=89
 'extends'=54
 'extension'=51
 'false'=88
 'final'=37
-'finally'=131
-'fires'=93
-'for'=108
-'if'=121
+'finally'=132
+'fires'=103
+'for'=109
+'if'=122
 'implements'=55
 'import'=56
-'instanceof'=120
+'instanceof'=121
 'interface'=57
 'native'=39
-'new'=95
-'null'=126
-'on'=96
+'new'=99
+'null'=127
+'on'=104
 'override'=45
 'package'=33
 'private'=31
 'protected'=32
 'public'=30
-'requires'=100
-'return'=129
-'skill'=107
+'requires'=108
+'return'=130
+'skill'=96
+'space'=97
 'static'=35
 'strictfp'=38
 'super'=87
-'switch'=110
+'switch'=111
 'synchronized'=41
-'throw'=128
+'throw'=129
 'throws'=58
 'transient'=42
-'true'=138
-'try'=130
-'typeof'=127
-'uses'=99
+'true'=139
+'try'=131
+'typeof'=128
+'uses'=107
 'val'=29
 'var'=43
 'volatile'=40
-'while'=124
-'with'=94
-'{'=101
-'|'=137
+'while'=125
+'with'=102
+'{'=90
+'|'=138
 '||'=26
-'}'=102
+'}'=91
 RULE_ANY_OTHER=24
 RULE_COMMENT_RICH_TEXT_END=14
 RULE_COMMENT_RICH_TEXT_INBETWEEN=12
@@ -172,6 +173,7 @@ T__135=135
 T__136=136
 T__137=137
 T__138=138
+T__139=139
 T__25=25
 T__26=26
 T__27=27