Add Text_Highlighter to Composer

- Fixes critical mistake in boot.php regarding set_include_path
- Fixes minor mistake in text.php regarding strpos order of arguments

Note: This change significantly increases Composer running time because
Text_Highlither is a PEAR package. I'm already planning to replace it
with scrivo/highlight.php.

vendor/bin/composer-php.bat

@@ -0,0 +1,11 @@
+@echo off
+setlocal enabledelayedexpansion
+set BIN_DIR=%~dp0
+set VENDOR_DIR=%BIN_DIR%\../
+set DIRS=.
+FOR /D %%V IN (%VENDOR_DIR%\*) DO (
+    FOR /D %%P IN (%%V\*) DO (
+        set DIRS=!DIRS!;%%~fP
+    )
+)
+php.exe -d include_path=!DIRS! %*