Plugin: BBB: Update upstream PHP API library

[ywarnier]

The version of the BigBlueButton API library for PHP we are using is old. It looks like the latest update from upstream that we did was in 2012: https://github.com/chamilo/chamilo-lms/commit/c4bb8e7ad8cc1e4a90df6a62d6d22f0faef76880#diff-dc18db170228ff0de18d69389f35fa62

Wouldn't it be a good idea to merge the ~10 changes that we made since then with the new version they provide at https://github.com/bigbluebutton/bigbluebutton-api-php/blob/master/src/BigBlueButton.php ?

Also, this might be better as a composer dependency...?

[ywarnier]

At least my last change about CURL is already in their latest version.

[ywarnier]

From what I can see, only the following changes have to be checked (the last one on CURL option was already checked):

• https://github.com/chamilo/chamilo-lms/commit/4b298278b7165dc02f4eac1370bfbd9d58434464#diff-dc18db170228ff0de18d69389f35fa62
• https://github.com/chamilo/chamilo-lms/commit/c5b4291d7868ddeea74ea2e04da27b18686c04c5#diff-dc18db170228ff0de18d69389f35fa62
• https://github.com/chamilo/chamilo-lms/commit/6b29f9c9ff0b6bf34267cf1a6fdbdf0928e6949c#diff-dc18db170228ff0de18d69389f35fa62 (this is a big one but the same change is repeated over and over)
• https://github.com/chamilo/chamilo-lms/commit/85ef745825150efca772b22ad0340bf9e53afc14#diff-dc18db170228ff0de18d69389f35fa62 (this one might be tricky)
• https://github.com/chamilo/chamilo-lms/commit/29cc82f9773bc98d95ce31030e0fb58631eeb71c#diff-dc18db170228ff0de18d69389f35fa62 (long)
• https://github.com/chamilo/chamilo-lms/commit/c393fe0aee7c4d870f38ab46101de772251d2ab7#diff-dc18db170228ff0de18d69389f35fa62 (long)
• https://github.com/chamilo/chamilo-lms/commit/e190df7d20079706d6cdc41ef8ee8f45a8eda0d2#diff-dc18db170228ff0de18d69389f35fa62 (long and complex?)
• https://github.com/chamilo/chamilo-lms/commit/0fd2cbcd10c53e3b56bfa1a1207b1dc1eb67eaec#diff-dc18db170228ff0de18d69389f35fa62 (just sanity check)

The rest is just code styling