More changes to reduce complaints from CppCheck.  Some latent bugs fixes, but probably some new typos introduced

Add a mouse interface that is similar to the touchscreen interface except that it can handle multple buttons and continuously reports positional data so that it can control a cursor

VI: all commands not seem functional.  Still at least on display artifact and probably some things not properly tested

NSH:  Add a break command; if-then-else and looping behavior can not be configured out of the build for small systems that need minimal scripting capability

NSH:  Loosen up if-then-else-fi syntx so that a command can be on the same line as the 'then' and 'else' tokens.  This allows, as an example, 'if true; then echo true; else echo false; fi' which is much more bash-like

NSH can not handle command arguments that are concatenations of constant strings, command output, application program output, and environment varaible values.

NSH: Separate command line parsing from command execution.  Add support for multiple, semicolone separated commands on each line

NxPlayer play thread stack size is now configurable;  all NxPlayer threads are named via pthread_setname_np().  From Ken Pettit