Add glm_perspective_rh_zo function + tests

This commit adds the RH/ZO perspective function. It does so in the new
file `cam_rh_zo.h` and further refactors the LH variant into new file
`cam_lh_zo.h`. This creates some churn in the tests and configuration
files as new test files were added as well, and all these changes found
their way into the build files.

Tests passing on Linux.

test/src/test_cam_lh_zo.c

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c), Recep Aslantas.
+ *
+ * MIT License (MIT), http://opensource.org/licenses/MIT
+ * Full license can be found in the LICENSE file
+ */
+
+#include "test_common.h"
+
+TEST_IMPL(perspective_lh_zo) {
+  mat4 dst;
+  const float fovy     = glm_rad(45.0f);
+  const float aspect   = 640/480.0f;
+  const float zNearVal = 0.1f;
+  const float zFarVal  = 100.0f;
+
+  glm_perspective_lh_zo(fovy, aspect, zNearVal, zFarVal, dst);
+
+  /* Sanity mk. I */
+  /* Longhand version of what the above function _should_ be doing */
+  ASSERT(test_eq(dst[0][0], 1 / (tanf(fovy / 2) * aspect)))
+  ASSERT(test_eq(dst[1][1], 1 / tanf(fovy / 2)))
+  ASSERT(test_eq(dst[2][2], zFarVal / (zFarVal - zNearVal)))
+  ASSERT(test_eq(dst[2][3], 1.0f))
+  ASSERT(test_eq(dst[3][2], -1 * zFarVal * zNearVal / (zFarVal - zNearVal)))
+
+  /* Sanity mk. II */
+  /* "Reference values" generated by GLM's glm::perspectiveLH_ZO */
+  mat4 cmp = {0};
+  cmp[0][0] = 1.8106601f;
+  cmp[1][1] = 2.4142134f;
+  cmp[2][2] = 1.0010010f;
+  cmp[2][3] = 1.0000000f;
+  cmp[3][2] = -0.1001001f;
+
+  return (test_assert_mat4_eq(dst, cmp));
+}