vec: some useful functions (#103)

These functions are added:
- abs(): absolute value
- fract(): fractional part
- norm_one(): L1 norm
- norm_inf(): infinity norm
- hadd(): horizontal add
- hmax(): horizontal max

src/vec3.c

@@ -74,6 +74,18 @@ glmc_vec3_norm2(vec3 v) {
   return glm_vec3_norm2(v);
 }
 
+CGLM_EXPORT
+float
+glmc_vec3_norm_one(vec3 v) {
+  return glm_vec3_norm_one(v);
+}
+
+CGLM_EXPORT
+float
+glmc_vec3_norm_inf(vec3 v) {
+  return glm_vec3_norm_inf(v);
+}
+
 CGLM_EXPORT
 void
 glmc_vec3_add(vec3 a, vec3 b, vec3 dest) {
@@ -382,6 +394,24 @@ glmc_vec3_sign(vec3 v, vec3 dest) {
   glm_vec3_sign(v, dest);
 }
 
+CGLM_EXPORT
+void
+glmc_vec3_abs(vec3 v, vec3 dest) {
+  glm_vec3_abs(v, dest);
+}
+
+CGLM_EXPORT
+void
+glmc_vec3_fract(vec3 v, vec3 dest) {
+  glm_vec3_fract(v, dest);
+}
+
+CGLM_EXPORT
+float
+glmc_vec3_hadd(vec3 v) {
+  return glm_vec3_hadd(v);
+}
+
 CGLM_EXPORT
 void
 glmc_vec3_sqrt(vec3 v, vec3 dest) {