Allow loading types with autoloading

[oprypkhantc]

Closes #659

The $autoload flag is true by default, as I feel that's sensible. But to avoid another breaking change I can change it to false.

Otherwise it's a simple fix. $autoload = true means a class would simply be autoloaded with class_exists() and that's it, same as ->addControllerNamespace(). $autoload = false means the "legacy" behaviour

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.30%. Comparing base (53f9d49) to head (255b287). Report is 70 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #660 +/- ## ============================================ - Coverage 95.72% 95.30% -0.43% - Complexity 1773 1820 +47 ============================================ Files 154 171 +17 Lines 4586 4854 +268 ============================================ + Hits 4390 4626 +236 - Misses 196 228 +32 ```

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