Added initial client UI structure.

src/client/config.nims

@@ -0,0 +1,73 @@
+switch "o", "bin/client"
+
+# Select compiler
+var TC = "gcc"                
+# var TC = "clang"             
+
+# Dismiss background window
+switch "app", "gui"
+
+# Select static link or shared/dll link
+when defined(windows):
+    const STATIC_LINK_GLFW = false
+    const STATIC_LINK_CC = true            #libstd++ or libc
+    if TC == "vcc":
+        switch "passL","d3d9.lib kernel32.lib user32.lib gdi32.lib winspool.lib"
+        switch "passL","comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib"
+        switch "passL","uuid.lib odbc32.lib odbccp32.lib"
+        switch "passL","imm32.lib"
+    else:
+        switch "passL","-lgdi32 -limm32 -lcomdlg32 -luser32 -lshell32"
+else: # for Linux
+    const STATIC_LINK_GLFW = true
+    const STATIC_LINK_CC= false
+
+when STATIC_LINK_GLFW: # GLFW static link
+    switch "define","glfwStaticLib"
+else: # shared/dll
+    when defined(windows):
+        if TC == "vcc":
+            discard
+        else:
+            switch "passL","-lglfw3.dll"
+            switch "define", "glfwDLL"
+            #switch "define","cimguiDLL"
+    else:
+        switch "passL","-lglfw"
+
+when STATIC_LINK_CC: # gcc static link
+    case TC
+        of "vcc":
+            discard
+        else:
+            switch "passC", "-static"
+            switch "passL", "-static "
+
+# Set compiler options
+case TC
+    of "vcc" , "clang_cl":
+        switch "define","lto"
+    else:
+        if "" == findExe(TC): # GCC is default compiler if TC dosn't exist on the PATH
+            echo "#### Set to cc = ",TC
+            TC = "gcc"
+        if "" == findExe(TC): # if gcc dosn't exist, try clang
+            TC = "clang"
+            echo "#### Set to cc = ",TC
+
+# Reduce code size further
+when false:
+    switch "gc", "arc"
+    switch "define", "useMalloc"
+    switch "define", "noSignalHandler"
+
+case TC
+    of "gcc":
+        switch "passC", "-ffunction-sections"
+        switch "passC", "-fdata-sections"
+        switch "passL", "-Wl,--gc-sections"
+        switch "cc",TC
+    of "clang":
+        switch "cc.exe","clang"
+        switch "cc.linkerexe","clang"
+        switch "cc",TC