Update Logging Class and add phpunit for Logging Class

Various fixes in the logging class for more clear internal flags setting
and clearn up of complex type checks and debug validation checks.
Add basic debugger logging class phpunit checker (based on debug/print
and only very basic for echo)

Other minor fixes and updates (phpunit with inital dead code check)

.phan/config.php

@@ -26,6 +26,8 @@
 use Phan\Config;
 
 return [
+	// turn color on (-C)
+	"color_issue_messages_if_supported" => true,
 	// If true, missing properties will be created when
 	// they are first seen. If false, we'll report an
 	// error message.
@@ -36,7 +38,7 @@ return [
 	"null_casts_as_any_type" => false,
 
 	// Backwards Compatibility Checking
-	'backward_compatibility_checks' => true,
+	'backward_compatibility_checks' => false,
 
 	// Run a quick version of checks that takes less
 	// time
@@ -46,6 +48,12 @@ return [
 	// (0 is low severity, 5 is normal severity, 10 is critical)
 	"minimum_severity" => 0,
 
+	// enable for dead code check
+	// this will spill out errors for all methods never called
+	// use after all is OK to try to find unused code blocks
+	// ignore recommended: PhanUnreferencedPublicMethod
+	// "dead_code_detection" => true,
+
 	// default false for include path check
 	"enable_include_path_checks" => true,
 	"include_paths" => [
@@ -120,6 +128,13 @@ return [
 	'suppress_issue_types' => [
 		// 'PhanUndeclaredMethod',
 		'PhanEmptyFile',
+		// ignore unreferences public methods, etc here (for dead code check)
+		'PhanUnreferencedPublicMethod',
+		'PhanUnreferencedClass',
+		'PhanWriteOnlyPublicProperty',
+		'PhanUnreferencedConstant',
+		'PhanWriteOnlyPublicProperty',
+		'PhanReadOnlyPublicProperty'
 	],
 
 	// Override to hardcode existence and types of (non-builtin) globals in the global scope.