Store essential dynamics parameters as vectors instead of linked list.

Store essential dynamics parameters as vectors instead of linked list.

Multiple sets of essential dynamics input parameters were stored as a
user implementation of a C-style forward linked list. We now use a
std::vector instead.

This simplifies parameter reading and makes it easier for read_edi to
return a vector of read parameters, which is now used.

Part of #2590

Change-Id: I2ad0705558deb8da7bd3fac35602364eadc4fc8d