Updated semantic highlighting (except for constant numeric values).

Organized DTRAMLanguageServer.java

Updated sub-channel keyword to latest one.

Updated main entry point

Removed unnecessary workspace service.

Added keyword tokens support in SemanticAnalyzer

Removed multiline comments support

Implemented basic semantic tokens.

Created semantic analyzer to be able to make tokens of atomic, string and type tokens semantic

Created semantic token based from Token.java

Moved some tokens from Tokens.java to Constants.java, Functions.java and Types.java

Moved comment tokens from Tokens.java to Comments.java

Separate tokens into Tokens.java, Keywords.java and Operators.java

Added package-info.java

Changed method signatures

Optimized some codes in Tokenizer#execute

Optimized some codes in Tokenizer#splitBySpace

Changed the way to split tokens by symbols and fixed known bugs.

Removed some regex constants.

Use String#length instead of String#codePointCount

Tokenizer#splitBySymbol is still buggy.

Changed access modifiers to be able to access methods in Tokenizer.java from TokenizerTest.java

Implemented Tokenizer#splitBySymbols to be able to tokenize by more symbols.

Implemented equals() to test in JUnit 5.

Implemented new constructor and fixed toString() and JavaDoc comments.

Added Position#move method.

Renamed some fields and methods in Token.java.

Made simple test-case for tokenizer.

Implemented model-file tokenizer that has abilities to tokenize comments and splits token by spaces.

Made skeleton of a model-file validator.

Implemented LSP4J to be able to launch basic language server.