compiler: remove unused stuff

Compiler.ps1

···
 		$this.Char = [String]($LexInput[0])
 	}
 	
-	hidden [Void] AssertElementState([ElementState] $Expected) {
-		if ($Expected -ne $this.State) {
-			throw "Bad lexer state: expected $Expected, got $($this.State)"
-		}
-	}
-	
 	hidden [String] PopChar() {
 		if ($this.NextPos -ge $this.LexInput.Length) {
 			$this.Char = ''
···
 					{$_ -eq [ElementState]::UNOPENED} {
 						$Token = [Token]::new( [TokenType]::OPEN_ELEMENT_START, $this.Char )
 						$this.State = [ElementState]::OPENED
-					}
-					{$_ -eq [ElementState]::OPENED} {
-						# $this.State = [ElementState]::
 					}
 					{$_ -eq [ElementState]::CLOSED} {
 						if ($this.PeekChar() -eq '/') {