refactor and reorganize code modules

lib/core/code/templates/function/function.v.template

@@ -0,0 +1,6 @@
+@if function.description != '' 
+// @{function.description}
+@endif
+pub fn @receiver @{name}(@{params}) @{result} {
+	@{function.body.trim_space().replace('\t', '')}
+}

lib/core/code/templates/interface/interface.v.template

@@ -0,0 +1,15 @@
+// @{iface.description}
+@if iface.attrs.len > 0
+[
+@for attr in iface.attrs 
+    @{attr.name}
+@end
+]
+@end
+@{prefix} interface @{name} {
+@{fields.join_lines()}
+@if mut_fields.len > 0
+mut:
+@{mut_fields.join_lines()}
+@end
+}

lib/core/code/templates/struct/struct.v.template

@@ -0,0 +1,26 @@
+@{comments}
+@if struct_.attrs.len > 0
+[
+@for attr in struct_.attrs 
+    @{attr.name}
+@end
+]
+@end
+@{prefix}struct @{name} {
+@for embed in struct_.embeds
+    @{embed.get_type_symbol()}
+@end
+@{priv_fields.join_lines()}
+@if pub_fields.len > 0
+pub:
+@{pub_fields.join_lines()}
+@end
+@if mut_fields.len > 0
+mut:
+@{mut_fields.join_lines()}
+@end
+@if pub_mut_fields.len > 0
+pub mut: 
+@{pub_mut_fields.join_lines()}
+@end
+}

lib/core/code/templates/v.mod.template

@@ -0,0 +1,7 @@
+Module {
+    name: '@{mod.name}'
+    description: '@{mod.description}'
+    version: '@{mod.version}'
+    vcs: '@{mod.vcs}'
+    license: '@{mod.license}'
+}