Libraries: Create top level directory for libraries.

Things were getting a little crowded in the project root, so this patch
moves the Lib*/ directories into Libraries/.

Libraries/LibM/math.cpp

@@ -0,0 +1,149 @@
+#include <LibC/assert.h>
+#include <LibM/math.h>
+
+extern "C" {
+double trunc(double x)
+{
+    return (int)x;
+}
+
+double cos(double angle)
+{
+    return sin(angle + M_PI_2);
+}
+
+double ampsin(double angle)
+{
+    double looped_angle = fmod(M_PI + angle, M_TAU) - M_PI;
+    double looped_angle_squared = looped_angle * looped_angle;
+
+    double quadratic_term;
+    if (looped_angle > 0) {
+        quadratic_term = -looped_angle_squared;
+    } else {
+        quadratic_term = looped_angle_squared;
+    }
+
+    double linear_term = M_PI * looped_angle;
+
+    return quadratic_term + linear_term;
+}
+
+double sin(double angle)
+{
+    double vertical_scaling = M_PI_2 * M_PI_2;
+    return ampsin(angle) / vertical_scaling;
+}
+
+double pow(double x, double y)
+{
+    (void)x;
+    (void)y;
+    ASSERT_NOT_REACHED();
+}
+
+double ldexp(double, int exp)
+{
+    (void)exp;
+    ASSERT_NOT_REACHED();
+}
+
+double tanh(double)
+{
+    ASSERT_NOT_REACHED();
+}
+
+double tan(double angle)
+{
+    return ampsin(angle) / ampsin(M_PI_2 + angle);
+}
+
+double sqrt(double)
+{
+    ASSERT_NOT_REACHED();
+}
+
+double sinh(double)
+{
+    ASSERT_NOT_REACHED();
+}
+
+double log10(double)
+{
+    ASSERT_NOT_REACHED();
+}
+
+double log(double)
+{
+    ASSERT_NOT_REACHED();
+}
+
+double fmod(double index, double period)
+{
+    return index - trunc(index / period) * period;
+}
+
+double exp(double)
+{
+    ASSERT_NOT_REACHED();
+}
+
+double cosh(double)
+{
+    ASSERT_NOT_REACHED();
+}
+
+double atan2(double, double)
+{
+    ASSERT_NOT_REACHED();
+}
+
+double atan(double)
+{
+    ASSERT_NOT_REACHED();
+}
+
+double asin(double)
+{
+    ASSERT_NOT_REACHED();
+}
+
+double acos(double)
+{
+    ASSERT_NOT_REACHED();
+}
+
+double fabs(double value)
+{
+    return value < 0 ? -value : value;
+}
+double log2(double)
+{
+    ASSERT_NOT_REACHED();
+}
+
+float log2f(float)
+{
+    ASSERT_NOT_REACHED();
+}
+
+long double log2l(long double)
+{
+    ASSERT_NOT_REACHED();
+}
+
+double frexp(double, int*)
+{
+    ASSERT_NOT_REACHED();
+}
+
+float frexpf(float, int*)
+{
+    ASSERT_NOT_REACHED();
+}
+
+long double frexpl(long double, int*)
+{
+    ASSERT_NOT_REACHED();
+}
+}