Style: Remove unnecessary semicolons from core

Semicolons are not necessary after function definitions or control flow
blocks, and having some code use them makes things inconsistent (and
occasionally can mess up `clang-format`'s formatting).

Removing them is tedious work though, I had to do this manually (regex
+ manual review) as I couldn't find a tool for that. All other code
folders would need to get the same treatment.

core/math/vector2.cpp

@@ -209,28 +209,29 @@ void Vector2i::operator-=(const Vector2i &p_v) {
 
 Vector2i Vector2i::operator*(const Vector2i &p_v1) const {
 	return Vector2i(x * p_v1.x, y * p_v1.y);
-};
+}
 
 Vector2i Vector2i::operator*(const int &rvalue) const {
 	return Vector2i(x * rvalue, y * rvalue);
-};
+}
+
 void Vector2i::operator*=(const int &rvalue) {
 	x *= rvalue;
 	y *= rvalue;
-};
+}
 
 Vector2i Vector2i::operator/(const Vector2i &p_v1) const {
 	return Vector2i(x / p_v1.x, y / p_v1.y);
-};
+}
 
 Vector2i Vector2i::operator/(const int &rvalue) const {
 	return Vector2i(x / rvalue, y / rvalue);
-};
+}
 
 void Vector2i::operator/=(const int &rvalue) {
 	x /= rvalue;
 	y /= rvalue;
-};
+}
 
 Vector2i Vector2i::operator-() const {
 	return Vector2i(-x, -y);