Use ANSI colors for test results; more polish (#771)

Any thrown Pkl Errors are colored in the simple test report!

Also:
* Refactor `TextFormatter` to be more generic; rename to `TextFormattingStringBuilder`
* Adjust test report slightly (no emojis, add more spacing).
* Introduce `ColorTheme` class.
* Make stack frame descriptors colored as "faint"

Also: this changes the summary so it summarizes _all_ modules, rather than a summary per module.

---------

Co-authored-by: Islon Scherer <islonscherer@gmail.com>
Co-authored-by: Philip K.F. Hölzenspies <holzensp@gmail.com>

pkl-commons-cli/src/main/kotlin/org/pkl/commons/cli/CliCommand.kt

@@ -164,6 +164,8 @@ abstract class CliCommand(protected val cliOptions: CliBaseOptions) {
     )
   }
 
+  protected val useColor: Boolean by lazy { cliOptions.color?.hasColor() ?: false }
+
   private val proxyAddress by lazy {
     cliOptions.httpProxy
       ?: project?.evaluatorSettings?.http?.proxy?.address ?: settings.http?.proxy?.address
@@ -284,7 +286,7 @@ abstract class CliCommand(protected val cliOptions: CliBaseOptions) {
       .setEnvironmentVariables(environmentVariables)
       .addModuleKeyFactories(moduleKeyFactories(modulePathResolver))
       .addResourceReaders(resourceReaders(modulePathResolver))
-      .setColor(cliOptions.color?.hasColor() ?: false)
+      .setColor(useColor)
       .setLogger(Loggers.stdErr())
       .setTimeout(cliOptions.timeout)
       .setModuleCacheDir(moduleCacheDir)