David Baker 31f38550e3 Refactor & make base64 functions browser-safe ...

We had two identical sets of base64 functions in the js-sdk, both
using Buffer which isn't really available in the browser unless you're
using an old webpack (ie. what element-web uses). This PR:

 * Takes the crypto base64 file and moves it out of crypto (because
   we use base64 for much more than just crypto)
 * Makes them work in a browser without the Buffer global
 * Removes the other base64 functions
 * Changes everything to use the new common ones
 * Adds a comment explaining why the function is kinda ugly and how
   soul destroyingly awful the JS ecosystem is.
 * Runs the tests with both impls
 * Changes the test to not just test the decoder against the encoder
 * Adds explicit support & tests for (decoding) base64Url (I'll add an
   encode method later, no need for that to go in this PR too).

2023-10-20 16:00:55 +01:00

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