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Things to do

• Remove the requirement to define the Event Function by the user even when events are not used
• EventAction: Ability to restart integration after encountering a discontinuity in the differential equations and aility to cross the discontinuity before restarting
• Ability to detect events beyond which the first-order derivatives cannot be conveniently evaluated
• Option to return a refined bracket for event for use in integration through discontinuity, event state at the beginning or end of the step
• Divide differential equations into secondary states that are not used in step-error computations, but only integrated (useful for integrating sensitivity and STMs)
• Option to compute Jacobians using finite-differencing for secondary states
• Test examples from https://reference.wolfram.com/language/tutorial/NDSolveWhenEvents.html
• Choice of different step-error and step-size computation formulae
• Compare the performance of matmul, gemm, and do loops for computation of ERK stages
• Implement hand-optimized step-integration routines for Verner98R/Verner65E also.

New Features

• Implement one General Linear Method (GLM) algorithm for stiff and non-stiff systems
• Adjoint method for computing parameter sensitivity matrices cheaply