XGA v0.4.3 release

Bug fixes for LightCurves and new features for the XGA Luminosity, Temperature, Radius pipeline

A new 'frozen-temperature' mode is included for the XGA-LTR, very strongly based on the XCS implementation in Giles et al. 2022 - meant for low surface brightness clusters that don't necessarily have the photons to constrain temperature and luminosity simultaneously through spectral fitting.

What's Changed

• Update requirements.txt by @DavidT3 in #1063
• Feat/light curve sas generation by @DavidT3 in #1072
• Changed the default value of 'pattern' for the get methods for lightc… by @DavidT3 in #1074
• Should have fixed the unpacking error that showed up in on_xmm_match by @DavidT3 in #1075
• Hopefully fixed the possible bug where reading in lightcurves will fa… by @DavidT3 in #1077
• Added a 'freeze_temp' argument to single_temp_apec, though it doesn't… by @DavidT3 in #1078
• Refine/fix fixed tx lx pipeline by @DavidT3 in #1081
• Should have fixed the bug where the aggregate profile view method wit… by @DavidT3 in #1083
• Bug/disass error when loading back in after lc gen by @DavidT3 in #1087

Full Changelog: v0.4.2...v0.4.3