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 ✅

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

Additional details and impacted files

@@             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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