loguru

Update fmtlib + add option to loguru::init to NOT set main thread name.

This release splits Loguru into two files: loguru.hpp and loguru.cpp.

The release also includes:

• Adjusted terminal colors
• LOGURU_VERBOSE_SCOPE_ENDINGS
• LOGURU_SCOPE_TIME_PRECISION
• custom names of log levels

• Auto-detect if RTTI should be enabled.
• Fix a bug where large file names could cause stack corruption.
• Shorten long file names to keep preamble fixed width.
• Add LOGURU_VERSION_{MAJOR,MINOR,PATCH} macros.

• Turn off individual parts of the preamble.
• Add loguru::get_fatal_handler
• Minor fixes

Add ability to turn off the preamble with loguru::g_preamble

First tag of loguru.