feat: Cambios Varios (mirar Desc)

- Añadidas referencias faltantes
- Arreglado FormProveedores
- Empiezo el codeo del Form Facturas

Vista/FrmProveedores.Designer.cs

@@ -61,6 +61,7 @@
             dataGridView1.Name = "dataGridView1";
             dataGridView1.ReadOnly = true;
             dataGridView1.RowTemplate.Height = 25;
+            dataGridView1.SelectionMode = DataGridViewSelectionMode.FullRowSelect;
             dataGridView1.Size = new Size(550, 235);
             dataGridView1.TabIndex = 3;
             // 
@@ -98,7 +99,7 @@
             // 
             AutoScaleDimensions = new SizeF(7F, 15F);
             AutoScaleMode = AutoScaleMode.Font;
-            ClientSize = new Size(800, 450);
+            ClientSize = new Size(800, 382);
             Controls.Add(groupBox1);
             Name = "FrmProveedores";
             Text = "Proveedores";