Tokenstream

Fix
* Prevent duplicating expected patterns ([`10cec04`](https://github.com/vberlier/tokenstream/commit/10cec045e3658333cf9a381fd166bcb8cf1a3064))

Fix
* Simplify expected_patterns merging ([`ad10e50`](https://github.com/vberlier/tokenstream/commit/ad10e50804770a11c530a8234aeadd6b9561fb0f))

Fix
* Properly prioritize errors that occur later in the stream ([`a665924`](https://github.com/vberlier/tokenstream/commit/a665924a68e43a6f0f7b1b8cc069761b32436323))

Fix
* Set invalid syntax location for unexpected token ([`4231809`](https://github.com/vberlier/tokenstream/commit/423180921e036bdfb0ea3c1025841248aedbb010))

Fix
* Handle windows line endings ([`068144d`](https://github.com/vberlier/tokenstream/commit/068144d0cadad0265ae292ec5dd9a925265735ef))

Fix
* With_horizontal_offset doesn't modify unkown location anymore ([`e17f897`](https://github.com/vberlier/tokenstream/commit/e17f897fec2feb53b0df3c7c62efdb0fe6c1fcd1))