Update '.gitignore'

.gitignore

@@ -1,20 +1,129 @@
-# ---> CodeIgniter
-*/config/development
-*/logs/log-*.php
-!*/logs/index.html
-*/cache/*
-!system/cache/*
-!*/cache/index.html
-!*/cache/.htaccess
+#-------------------------
+# Operating Specific Junk Files
+#-------------------------
 
+# OS X
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# OS X Thumbnails
+._*
+
+# Windows image file caches
+Thumbs.db
+ehthumbs.db
+Desktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+# Linux
+*~
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+#-------------------------
+# Environment Files
+#-------------------------
+# These should never be under version control,
+# as it poses a security risk.
+.env
+.vagrant
+Vagrantfile
+
+#-------------------------
+# Temporary Files
+#-------------------------
+writable/cache/*
+!writable/cache/index.html
+
+writable/logs/*
+!writable/logs/index.html
+
+writable/session/*
+!writable/session/index.html
+
+writable/uploads/*
+!writable/uploads/index.html
+
+writable/debugbar/*
+!writable/debugbar/index.html
+
+writable/**/*.db
+writable/**/*.sqlite
+
+php_errors.log
+
+#-------------------------
+# User Guide Temp Files
+#-------------------------
 user_guide_src/build/*
-user_guide_src/cilexer/build/*
-user_guide_src/cilexer/dist/*
-user_guide_src/cilexer/pycilexer.egg-info/*
 
-#codeigniter 3
-application/logs/*
-!application/logs/index.html
-!application/logs/.htaccess
-/vendor/
+#-------------------------
+# Test Files
+#-------------------------
+tests/coverage*
+
+# Don't save phpunit under version control.
+phpunit
+
+#-------------------------
+# Composer
+#-------------------------
+vendor/
+composer.lock
+
+#-------------------------
+# IDE / Development Files
+#-------------------------
+
+# Modules Testing
+_modules/*
+
+# phpenv local config
+.php-version
+
+# Jetbrains editors (PHPStorm, etc)
+.idea/
+*.iml
+
+# Netbeans
+nbproject/
+build/
+nbbuild/
+dist/
+nbdist/
+nbactions.xml
+nb-configuration.xml
+.nb-gradle/
+
+# Sublime Text
+*.tmlanguage.cache
+*.tmPreferences.cache
+*.stTheme.cache
+*.sublime-workspace
+*.sublime-project
+.phpintel
+/api/
+
+# Visual Studio Code
+.vscode/
+
+/results/
+/phpunit*.xml
 
+/.php-cs-fixer.php