Change error handling from throwing an exception to returning a boolean value

[annexus254]

In case an error occurs during loading of a context, let the Context::load() method return a boolean value indicating whether the context was successfully loaded or not. Throwing an Exception causes a false positive in debuggers,since the Context::load() method does the correct thing anyway

[codecov[bot]]

Codecov Report

Merging #384 (233788b) into 6.0.x (9b6be66) will decrease coverage by 0.00%. The diff coverage is 100.00%.

@@             Coverage Diff              @@
##              6.0.x     #384      +/-   ##
============================================
- Coverage     95.20%   95.20%   -0.01%     
+ Complexity     2162     2161       -1     
============================================
  Files            66       65       -1     
  Lines          4591     4588       -3     
============================================
- Hits           4371     4368       -3     
  Misses          220      220              

Impacted Files	Coverage Δ
src/Context.php	97.68% <100.00%> (ø)

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