[lib][console] rename some console command types to be prefixed with console_

Some of the structures, notably 'cmd', in the lib console stuff are a
little too generically named and have collided with some other code
so prefix the names a bit more cleanly with console_

The change is largely mechanical, and folks with out of tree code can
easily switch by renaming:
cmd -> console_cmd
cmd_args -> console_cmd_args
cmd_block -> console_cmd_block
console_cmd -> console_cmd_func

Apologies if this breaks you but it should be pretty easy to fix.

app/tests/port_tests.c

@@ -707,7 +707,7 @@ int group_waiting(void) {
 
 #define RUN_TEST(t)  result = t(); if (result) goto fail
 
-int port_tests(int argc, const cmd_args *argv) {
+int port_tests(int argc, const console_cmd_args *argv) {
     int result;
     int count = 3;
     while (count--) {