Change structs to match imgui 1.84

Also change oddly-specific test to avoid having to change it every update

imgui/src/fonts/atlas.rs

@@ -48,6 +48,7 @@ pub struct FontAtlas {
     pub tex_glyph_padding: i32,
 
     locked: bool,
+    text_ready: bool,
     tex_pixels_use_colors: bool,
     tex_pixels_alpha8: *mut u8,
     tex_pixels_rgba32: *mut u32,

imgui/src/fonts/font.rs

@@ -19,6 +19,7 @@ pub struct Font {
     pub config_data_count: i16,
     pub fallback_char: sys::ImWchar,
     pub ellipsis_char: sys::ImWchar,
+    pub dot_char:  sys::ImWchar,
     pub dirty_lookup_tables: bool,
     pub scale: f32,
     pub ascent: f32,

imgui/src/io.rs

@@ -292,6 +292,7 @@ pub struct Io {
     pub mouse_delta: [f32; 2],
 
     key_mods: sys::ImGuiKeyModFlags,
+    key_mods_prev: sys::ImGuiKeyModFlags,
     mouse_pos_prev: [f32; 2],
     mouse_clicked_pos: [[f32; 2]; 5],
     mouse_clicked_time: [f64; 5],

imgui/src/lib.rs

@@ -96,7 +96,7 @@ pub fn dear_imgui_version() -> &'static str {
 #[test]
 fn test_version() {
     // TODO: what's the point of this test?
-    assert_eq!(dear_imgui_version(), "1.82");
+    assert!(dear_imgui_version().starts_with("1."));
 }
 
 impl Context {

imgui/src/style.rs

@@ -10,6 +10,8 @@ use crate::Direction;
 pub struct Style {
     /// Global alpha applies to everything
     pub alpha: f32,
+    /// Additional alpha multiplier applied to disabled elements. Multiplies over current value of [`Style::alpha`].
+    pub disabled_alpha: f32,
     /// Padding within a window
     pub window_padding: [f32; 2],
     /// Rounding radius of window corners.