Fix typos

[guillemj]

This fixes lots of typos that end up in the generated output, possibly in other projects, which would then be unable to fix these typos as they will reappear when running asn1c again.

Warned-by: codespell

[coveralls]

Coverage remained the same at 70.906% when pulling 7ee8e4356b0b111da03e14142c115c7b31b17b70 on guillemj:pu/typos into fdb68ce2782423ce38caf84f28441d1b0776e9ee on vlm:master.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}