improve timer handling

src/main/java/avatartranslator/tosysmlv2/Avatar2SysML.java

...java/avatartranslator/tosysmlv2/AvatarFromSysMLLexer.java

...ava/avatartranslator/tosysmlv2/AvatarFromSysMLParser.java

...va/avatartranslator/tosysmlv2/AvatarFromSysMLSymbols.java

...a/avatartranslator/tosysmlv2/javacup/AvatarFromSysML.jcup

.../avatartranslator/tosysmlv2/javacup/AvatarFromSysML.jflex

.../avatartranslator/tosysmlv2/static/AvatarBlockTypes.sysml

ttool/src/test/java/cli/CLIAvatar2SysMLV2Test.java

...st/resources/cli/models/avSysML_AttrTimerNameClashL.sysml

.../src/test/resources/cli/models/avSysML_dupAttrDeclK.sysml

...t/resources/cli/models/avSysML_missingBlockBindErrH.sysml

...est/resources/cli/models/avSysML_missingSndPayloadN.sysml

...t/resources/cli/models/avSysML_missingTimerDeclErrI.sysml

...esources/cli/models/avSysML_missingTimerOnTransErrJ.sysml

...sources/cli/models/avSysML_missingTransRecvPayloadM.sysml

ttool/src/test/resources/cli/models/avSysML_timer.sysml

...rc/test/resources/cli/models/avSysML_timerRealNames.sysml