metagen: simplify catchall generations; move some codeview enums into metacode; generate enum->string code

src/df/core/df_core.mdesk

@@ -1796,7 +1796,7 @@ DF_DevToggleTable:
 
 //- rjf: core view rule function prototypes
 
-@table_gen
+@gen
 {
   @expand(DF_CoreViewRuleTable a) `$(a.er == "x" -> "DF_CORE_VIEW_RULE_EVAL_RESOLUTION_FUNCTION_DEF(" .. a.name_lower .. ");")`;
   @expand(DF_CoreViewRuleTable a) `$(a.vb == "x" -> "DF_CORE_VIEW_RULE_VIZ_BLOCK_PROD_FUNCTION_DEF(" .. a.name_lower .. ");")`;
@@ -1827,7 +1827,7 @@ DF_DevToggleTable:
 
 //- rjf: instruction metadata table
 
-@table_gen
+@gen
 {
   ``;
   `struct{String8 mnemonic; String8 summary;} df_g_inst_table_x64[] =`;
@@ -1839,12 +1839,12 @@ DF_DevToggleTable:
 
 //- rjf: developer toggles
 
-@table_gen
+@gen
 {
   @expand(DF_DevToggleTable a) `global B32 DEV_$(a.name) = 0;`
 }
 
-@table_gen
+@gen
 {
   `struct {B32 *value_ptr; String8 name;} DEV_toggle_table[] =`;
   `{`;

src/df/gfx/df_gfx.mdesk

@@ -518,7 +518,7 @@ DF_ThemePresetColorTable:
 
 //- rjf: view hook forward declares
 
-@table_gen
+@gen
 {
   @expand(DF_GfxViewTable a) `DF_VIEW_SETUP_FUNCTION_DEF($(a.name));`;
   @expand(DF_GfxViewTable a) `DF_VIEW_STRING_FROM_STATE_FUNCTION_DEF($(a.name));`;
@@ -528,7 +528,7 @@ DF_ThemePresetColorTable:
 
 //- rjf: gfx view rule function forward declares
 
-@table_gen
+@gen
 {
   ``;
   @expand(DF_GfxViewRuleTable a)