feat: creating new mx_ suite of macros!

also adding new mx_getcode macro

tests/base/mcf_init.test.sas

@@ -0,0 +1,46 @@
+/**
+  @file
+  @brief Testing mcf_init.sas macro
+
+  <h4> SAS Macros </h4>
+  @li mcf_init.sas
+  @li mp_assert.sas
+
+**/
+
+%mp_assert(
+  iftrue=(%mcf_init(test)=0),
+  desc=Check if new func returns 0
+)
+%mp_assert(
+  iftrue=(&syscc=0),
+  desc=No errs on basic invocation
+)
+%mp_assert(
+  iftrue=(%mcf_init(test)=1),
+  desc=Check if second invocation returns 1
+)
+%mp_assert(
+  iftrue=(&syscc=0),
+  desc=No errs on second invocation
+)
+%mp_assert(
+  iftrue=(%mcf_init(test2)=0),
+  desc=Check if new invocation returns 0
+)
+%mp_assert(
+  iftrue=(%mcf_init(test2)=1),
+  desc=Check if second new invocation returns 1
+)
+%mp_assert(
+  iftrue=(%mcf_init(test)=1),
+  desc=Check original returns 1
+)
+%mp_assert(
+  iftrue=(%mcf_init(t)=1),
+  desc=Check subset returns 1
+)
+%mp_assert(
+  iftrue=(&syscc=0),
+  desc=No errs at end
+)