With the Mantle mod is my Minecraft launcher crashing, by mod loading.
Crash report:
crash.txt

First, I don't see how you decided Mantle is the problem. First line of the report is airbreather/mods/airbreathercore/mod/IModule which is clearly not us.

Second, we have not supported 1.7 for over 5 years, use at least a somewhat modern version

Third, bottom of the crash report

Mantle Environment: DO NOT REPORT THIS CRASH! Unsupported mods in environment: optifine