Reworked Toy_String as a union, enabled -Wpedantic

Toy now fits into the C spec.

Fixed #158

Addendum: MacOS test caught an error:

error: a function declaration without a prototype is deprecated in all versions of C

That took 3 attempts to fix correctly.

Addendum: 'No new line at the end of file' are you shitting me?

tests/standalone/hash_generator_1.c

@@ -8,7 +8,7 @@ static unsigned int hashUInt(unsigned int x) {
     return x;
 }
 
-int main() {
+int main(void) {
     //print the index/hash pairs
     for (unsigned int i = 0; i < 100; i++) {
         unsigned int h = hashUInt(i);

tests/standalone/hash_generator_2.c

@@ -8,7 +8,7 @@ static unsigned int hashUInt(unsigned int x) {
     return x;
 }
 
-int main() {
+int main(void) {
     //find the first number with a specific hash, then print the c-code
     for (unsigned int h = 0; h < 20; h++) {
         for (unsigned int i = 0; i < 100; i++) {

tests/standalone/makefile

@@ -1,6 +1,6 @@
 #compiler settings
 CC=gcc
-CFLAGS+=-std=c17 -g -Wall -Werror -Wextra -Wpointer-arith -Wformat=2
+CFLAGS+=-std=c17 -g -Wall -Werror -Wextra -Wpedantic -Wformat=2
 LIBS+=-lm
 LDFLAGS+=
 

tests/standalone/platform_behaviours.c

@@ -103,7 +103,7 @@ int getFileName(char* dest, const char* src) {
 	return len;
 }
 
-int main() {
+int main(void) {
 	//check the platform
 	printf("Platform: ");
 #if defined(__linux__)