This release includes the following major enhancements:
- Support for flexible floating platforms and expansion of linearization capability (#537)

### AeroDyn
#645 Add Eames tower shadow model to AD15
#643 Support primary input file parsing through strings

### BeamDyn
#615 [BugFix] Initialized error variables
#636 Add unit tests for BD_ComputeIniNodalCrv

### HydroDyn
#537 Flexible floating platforms
#615 Morison performance improvement
#634 Fix HydroDyn linearization matrix multiplication using unallocated arrays

### InflowWind
#642 [BugFix] Reenable InflowWind echo file lost in #596

### NWTC Library
#615 NWTC Lib bug fixes

### Simulink Interface
#641 [BugFix] Simulink error message overwrite

### Testing
#637 Use default runner and GFortran 10
#635 Use Intel 2021 Toolset for regression test


